Sewing machine



May 8, 1956 Filed May 28, 1952 o. HESS 2,744,482

SEWING MACHINE 2 Sheets-Sheet l I/wnvro/e 0770 Haas May 8, 1956 o, gss 2,744,482

SEWING MACHINE Filed May 28, 1952 2 Sheets-Sheet 2 0770 H sass @M *Ws.

v SEWING MAcrnNn Otto Hess, Ludwigsburg, Wurttemberg, Germany, i

Application May 28, 1952, SerialNO. 29 0,445 Claims priority, application Germany June 8 1951.

6 Claims. c|. 1 12 zss)- 1 The present invention concerns a sewing machine particularly a high-speed sewing machine with pressure lubri cation, in which are incorporated an oilpan below the sewing unit and an oil pumplsucki'ng off the oil outof the oilpan and feeding it to theflubricating points of the sewing unit.

.1 g '5 It is the object of the presentjinyentiomto, lofcatethe .seWing unit on the oilpan, as well as, to mount the oilpan in-thetable of the sewing machine in sucha manner as to prevent the vibrations of the sewing ;unit during opera ation from being transmitted to the oilpan; and the -oil contained therein, and to prevent the Olizfl'OlIl penetrat vI ing directly from the oilpan to the stitching parts of the I Y "sewing unit or to the workpiece. I

1 Another object of the invention is to seal the; oilpan in 1 such. a manner as to prevent the-downy fibers of the United. States Patent ,0

located at the top edge 2' 2,744,482 Patented May 8, 1956 mediate a screw 24, which preferablyfis arranged countersunk in the cushion 10. Besides this the ground surface of each recess 23 is formed with acavity 23 into which the cushion 10 is inserted. j

It is suitable to reinforce thetop edge 2 of the oilpan 2, compared with the other sides of the oilpan. This reinforced edge 2' carries the sewing unit I mounted :on the ground-plate 22. a t q The sewing unit 1 may be designed in any suitable .manner. It comprises all partsnecessary to perform the sewing functions according-to conventional practice;

As the oilpan 2 has four sides, the top edge 2' ofzthe oilpan is composed of four parts positioned in one plane.

1 ,The' top edge of the oilpan 2fat-i:theinner portions of the four parts are formed with an open groovew running all-around thetop edge 2'. A resilient, oil-resistantintermediate 1ayeru12 made out of rubber, e..g., is inserted i into the groove 11. Themintermediate layer 12'is'Tpro- 'jecting beyond the upper s'urface'ofthe parts forming; the

worked material and the dustfrom penetrating into the- ,interior of the machine, which may bethe cause of breakdown. In viewof this I provide in a high-speed sewing machine a sewing unitincluding-aground-plate supporting thesewing unit, a table with a substantially rectangularf' cut-out portion, an oilpan, located belowthe sewing-unit and suspended in said cut-outportion and provided With- ,parts adapted to support said oilpan in said cut-outportion, cushions made of resilient materials arranged ,between said table and said supporting parts of the :oilpan,

. the bottom of said sewing-unit including the ground-plate being arranged at the top edge of said oilpan, an:.intermediate layer made out of resilient, oil-resistant material inserted between said bottom of said sewing-unit and said top edge of said oilpan, at least one screw penetrating said ground'plate and connecting together said ground plate and the bottom of said oilpan, resilient oil-resistant material, arranged between said screw and said ground plate, an oil pump adapted to feed oil from said oilpan to said sewing unit. I

Other objects and advantages of the present invention will be pointed out in the hereinafter following description of an illustrative embodiment thereof, or will be understood by those conversant with the subject. In the accompanying drawing is:

Fig. 1 a view of the sewing machine with a longitudinal sectional view of the oilpan; 1

Fig. 2 a top view of the oilpan; Fig. 3 a top view of the oilpan;

Fig. 4 a fragmentary sectional view of one end'of the oilpan showing the mounting of the sewing unit on the oilpan; I 1

Fig. 5 an enlarged sectional view of another realization of the mounting of the sewing unit on the oilpan, and

Fig. 6 a sectional view of a further'execution of the connection between the ground plate and the oilpan.

The sewing machine according to the invention-com prises a table 8, which is supplied with a substantially rectangular cut-out portion-'7.' In this cut-outportion 7 an oilpan 2 is suspended by means of support arms 9 top edge 2 of the oilpan 2. Upon theintermediatelayer 12 rests the sewing unit 1 by means of the groundplate 22,-to which end the sewing unit l is surrounded by a flange1..' 1 i As set forth in Fig. 5 substantially, it is suitable'that ..-the supporting face of the sewing unit 1, i. e., the bottom face of the flange 1', which-rests upon the resilient oilresistant intermediate layer 12, is supplied withflutes 25 arranged in parallel direction to the sides of the oilpan 26 penetrates into the said layer 12, thus achieving a V reliable sealing of the oilpan.. The ,sewingunit 1 and I 2. The flutes 25 form between 'thema rib..26 .having the ,Shape of an edge. .As the bottom face of the flange lcompresses the resilient intermediate layer 12,- the edge the oilpan 2 are connected to each other by atleast one,

, preferably two screws 16. 7

a Accordingto the realization set forth inlFighl, the ground-plate 22 has a bore 27. The screw 16 penetrates I through the bore 27 without touching'the wallst thereof.

1 The bore 27 is covered by a perforated cylinder 28 made out of resilient and oil-resistant material, for example rubber. The screw 16 penetrates the perforation of the cyl- H inder 28 which is compressed by the head 29 of the screw '28. The .screw 28 is screwed into the bottom 25 of the oilpan 2, so. that an oil-tight connection is produced between the sewing unit 1 and theoilpan 2, which connection, however, does not transmit any vibrations.

, The ground plate 22 of the sewing unit 1 as well, as

the bottom 2" of the oilpan 2 are appropriately reinforced byeyes 30, located within the range 'of thescrew connection. 3 y I 7 Asecond realization according to Fig. 6 1S characterized by a ground plate 22, a bore 14 and a concentric recess 31. The bore 14 and the recess 31 1are filled up by a flanged bushing 15 made of resilient, oil-resistant Thescrew 16 penetrates a bore 7 material, e. g. rubber.

" of the bushing 15 and is screwed in the bottom 2" of the oilpan 2. A resilient compression spring 17 is' arranged between the head 29' of the screw 16 and the top surface of the flange of the bushing 15.

An oil pump 3 is mounted in an opening of the ground plate 22, which opening may be shaped as a collar 32.

The oil pump. 3 feeds oil to the lubricating points of the 3 sewing unit 1, the oil 'thereat circulating in a closed .cycle.

Opposite to the oil pump 3, the bottom 2" of the oilpan 2 has a spherical thickening 21 which flattens down radi- :.i ally'ifromtthe centreaxis of the oil pump. 3. .sThisthickening causes impurities to glide. down atthimpoinhzsothat 2i theyrdo not; reach into the pump 3.

1. he:bottom 2f: of. the oilpan .2 descends in. thedirection :zfrom theawall of the oilpan 2 adjacent to.the: thickening 2lztonthe ropposite .wallof the oilpan 2.. "An oilpoutlet incapable to bezclosed by a drain plug 18 islocated at the *szdeepest level ofthe oilpan 2. Furthermore, the.bottom I 2720i thelioilpanrZ is'providedrwith leading ribs 19, located azobliquelyito. each other and destined to lead the. oil in the 1 meighbourhood of the oil .outleti'33, thus'rpreventingthe wee-entrance: of impurities into the lubricatinguoil.

6' Also'the ground-platex22 of-the sewingsunit 1 is in clined with respect to the horizontalrplane. ;An:opening A934 issupplied at the deepest point of the ground plate 22. 1'. In the'openingi34' an.oil filteri 35 is inserted,wwhich allows "athezroil dropping:down: fromxthesewing unit 1..to the ground-plate 22 to return into the oilpan 2. i iIIhe'driving motor .4 is rnounted below the oilpan 2. It ;.:drives': ithecsewingimachine through :pulley's wand '37 bymeans'of a'belt which is not represented in the drawing. i'The oiPpump 3 is'operated inanysuitable manner .arbyuthe' sewing unit 1. uThe drivingz motor 4 is adapted to suck-in coolingair atatwonersidewand to'blow'it off at the opposite .side, as wrepresentedtby the arows A, B, C inn-the drawing. I :This weanling-air; strikes the lower surface of the oilpan 2, which; in' the region submitted to the cooling'efifect; is supplied witnwebs 38, so that the oil contained in the oilpa'n 2 is cooled.

-IWha't I.claim is:

li -In a high-speed sewing machine having a table with a cut-out portion and a sewing unit with a bed provided with depending side and end walls and an oilpan secured to said-bed andarranged withinthe cut-out portion-of said table and supported by said table and having upturnedwalls-forming a chamberwith said bed, a frame =structurecomprising means for connecting the bedand oilpan together and with said table, said bed being rec- Mtangulavand provided with a bottom plate integral-with the'bed"to' form a separate chamber adapted to receive driving'mechanism of'the sewing unit, said bed on-its side and endwalls being-provided with acircumferential =-'=flange=arranged' in ahorizontal' plane in a lower part of the walls above the bottom plate, the oilpanhaving'up- --"turned'walls ending in a horizontal reinforced top edge, -th'e 'inne r" portion of which are provided with a circum- -iere'ntialopen'groove, the lower part of the bed below ""th flange being' shaped to enter the oilpan and thereby 'the oilpan'supports-the bed-and thesewing-unit, a =resilientoilresisting' intermediate layerbetweensaid flange 'andsaid"groove,-means for tightly connecting saidbed and saidoilpan together, the cut-out portion in the table "receiving theupper'part of the oilpan with a distance spaced between the "walls and the reinforced topedge of the oilpan'and-the edges of the cut-out portion, support arms at.each'corner of the top-edge ofthc oiipan,.the 'tablebcing' provided with recesses at the "edges'of'the "cut-out portion corresponding to the support arms, a cushion of resilient material arranged in each recess at the ."edges, and an"oil pump being provided in a .bore'ot a T .bossfof the bottom plate of the bed, and-the. bottom of said oilpan being provided with a projection of.'substan- L. tially spherical form coaxially with the oil pump to per- .mit impurities'contairied in the. oil to slide down on the spherical form and escape to the-pump.

2. .In a high-speed sewing machine having a tablewith a cut-out portion and a sewing unit.with abed provided with depending side and end walls and anoilpan secured to said bed and arranged within. the cut-out portioncf table. and supported by said. table .and-having lup- 'i 4 turned walls forming a chamber with said bed, a frame structure comprising. means for connecting the bed. and oilpan together and with. said table, said bed being rectangular and provided with a bottom plate integral with 5 the bed to form a separate chamber adapted to receive driving mechanism of the sewing unit, said bed on its side and end walls being provided with a circumferential flange arranged in a horizontal plane in a lower part of the walls above the bottom-plate, the oilpan having upturned walls ending in a horizontal reinforced top edge,

the inner portions of which are provided with a circumferential open groove; the lower part of thebed below the flange being shaped to enter the oilpan and thereby the oilpan supports-the bed and the sewing unit, aresilient oil-resisting intermediate-layer.between said flange and said groove, means for tightly connecting said bed and said oilpan together, the cut-out portion in the table receiving the upper part of the oilpan with a distance ..spaced'.between the wallsvand the'reinforccd top-edge of ;.the oilpan and the edges of the cut-out portion, support :arms at each corner of the top-edge of the oilpan, the ..table.being provided with recesses at theedges of the :ncut-out-portion corresponding to the support arms, a cushion of resilient material arranged in each recess at :the edges, and the bottom of the oilpan being arranged in- =1-"clined with respect to the horizontal, a projection provided in the higher part of said bottom, and an oil outlet "--provided at the deepest point of said bottom, ribs .being provided on said bottom and arranged in a direction to -fced the oil-to said outlet.

'3. 'In a high-speed-sewing machine having a table'with a cut-out portion and a sewing unit with a bed provided with depending side and end walls and an oilpan secured j-to 'said bed and arranged within the cut-out portionof said-table-and supported by said tableand having upturncd' w'alls forming a chamber with said bed, a frame structure comprising means for connecting the bed and oilpan-'together-and withsaid table, said bed being meix--tangular and providedwith a bottom plate integral with "*thebed to-forrn a separate'chamber adapted to receive 'driving rnechanism of the sewing unit, said bed on'its side and' end walls being provided with a circumferential :flange'arranged in a horizontal plane in a lower part of the walls above the bottom plate, the oilpan having up- 511turned :walls'ending in a horizontal reinforced top edge, 1 iutherinner portions ofwhich are provided with a circumferentialopen groove, the lower part of the. bed below the niflange beingrshaped to entcr the 'oilpan and thereby-the i oilpanqsupportsxthcrbed and the sewing unit, a resilient -:;oil.-;resisting: intermediate layer between said flange and :said: groovepmeans 'fortightly connectingsaid bed and :"i said.,.oilpan' together, the cut-out portion in the table re- :mceivingtheupper part of the oilpan. with adistancc spaced ::between. the walls and the reinforced. top .edge .of. the oilpan and the edges of the cutrout portion, support .-.=arms. atz.each:corner.of the. top-edge of the: oilpan, the ltablc beingprovided with recesses at theedges of tho i .cut-out portion corresponding to the support arms, a cushion of resilient material arranged in each recess atrthe edges, and a driving motor provided for the sewing manshine mounted below the oilpan, said driving motor'being adapted to take in cooling airrtlowing along the lower surface of the oilpanyand said lower surface of said oilpan being provided with coolingifins. I 4.:In a: high-speed sewing. machine having a table with a cut-:out portion and a Sewing unit with ahed provided with depending side and end walls and an oilpan secured to=-said. bed .and arranged within the .cubout portion of said table and.supported .by. said .tableand havingnup- ,.turned.walls-forming a chamber with said bed, a frame structure comprising means forconnecting the bedand ....oilpan: together; and with said table, saidbed being rec- ..htangularand provided with a bottom plate .integralwith the..bed to. form a. separate chamber'adapted to. receive i .drivjng.mechanism. ofsthesewingv unit, said bed on its side and end walls being provided with a circumferential flange arranged in horizontal plane in a lower part of the walls above the bottom plate, the oilpan having upturned walls ending in a horizontal reinforced top edge, the inner portions of which are provided with a circumferential open groove, the lower part of the bed below the flange being shaped to enter the oilpan and thereby the oilpan supports the bed and the sewing unit, a resilient oilresisting intermediate layer between said flange and said groove, means for tightly connecting said bed and said oilpan together, the cut-out portion in the table receiving the upper part of the oilpan with a distance spaced between the walls and the reinforced top edge of the oilpan and the edges of the cut-out portion, support arms at each corner of the top-edge of the oilpan, the table being provided with recesses at the edges of the cut-out portion corresponding to the support arms, a cushion of resilient material arranged in each recess at the edges, and the bottom plate of said bed being arranged inclined with respect to the horizontal, the deepest point of said bottom plate being provided with an opening, and an oilfilter provided arranged to drop the filtered oil into the oilpan.

5. In a high speed sewing machine having a base plate forming part of the bottom frame of the machine and provided with a flange, an oil pan comprising a bottom member and side walls with top edges to cooperate with the flange of the bottom frame, means connected to the bottom member and the base plate to secure the oil pan to the bottom frame with a tight connection of the top edges with the flange of the bottom frame, the bottom member with the side walls and the base plate forming a separate chamber for the oil, supporting arms secured to the top edges of the oil pan in spaced relationship acting to support the sewing machine, a projecting portion provided on the bottom member extending a short distance above the inner surface of the bottom'member, and a pump mounted in the base plate and extending just above the projecting portion, the latter preventing impurities from entering the pump.

6. In a high speed sewing machine having a base plate forming part of the bottom frame of the machine and provided with a flange, an oil pan comprising a bottom member and side walls with top edges to cooperate with the flange of the bottom frame, means connected to the bottom member and the base plate to secure the oil pan to the bottom frame with a tight connection of the top edges with the flange of the bottom frame, the bottom member with the side Walls and the base plate forming a separate chamber for the oil, supporting arms secured to the top edges of the oil pan in spaced relationship acting to support the sewing machine, and the outer surface of the bottom member being provided with a plurality of fins acting to cool the oil in the pan by air streaming past the fins from a fan on a driving motor of the sewing machine secured to the bottom member of the oil pan.

References Cited in the file of this patent UNITED STATES PATENTS 1,230,461 Brush June 19, 1917 1,299,143 De Voe Apr. 1, 1919 1,334,088 Goldstone Mar. 16, 1920 1,350,729 Kiewicz Aug. 24, 1920 2,266,140 Zeier Dec. 16, 1941 2,300,583 Marsac July 16, 1941 2,305,343 Gadbois Dec. 15, 1942 2,347,629 Hale Apr. 25, 1944 2,477,433 Webb July 26, 1949 2,584,243 Washburn Feb. 5, 1952 

